Hello alex, We test a call trace as follows use ARM64 architecture, it prints a WARN_ON() when find not physical address by iova in vfio_unmap_unpin(), I can't find the cause of problem now, do you have any ideas? In addition, I want to know why there is a WARN_ON() instead of BUG_ON()? Does it affect the follow-up process? Thanks, Yiwen. 2019-05-17T15:43:36.565426+08:00|warning|kernel[-]|[12727.392078] WARNING: CPU: 70 PID: 13816 at drivers/vfio/vfio_iommu_type1.c:795 vfio_unmap_unpin+0x300/0x370 2019-05-17T15:43:36.565501+08:00|warning|kernel[-]|[12727.392083] Modules linked in: dm_service_time dm_multipath ebtable_filter ebtables ip6table_filter ip6_tables dev_connlimit(O) vhba(O) iptable_filter elbtrans(O) vm_eth_qos(O) vm_pps_qos(O) vm_bps_qos(O) bum(O) ip_set nfnetlink prio(O) nat(O) vport_vxlan(O) openvswitch(O) nf_nat_ipv6 nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 gre signo_catch(O) hotpatch(O) gcn_hotpatch(O) kboxdriver(O) kbox(O) ib_isert iscsi_target_mod ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib ib_umad rpcrdma sunrpc rdma_ucm ib_uverbs ib_iser rdma_cm iw_cm ib_cm aes_ce_blk crypto_simd cryptd ses aes_ce_cipher enclosure crc32_ce ghash_ce sbsa_gwdt sha2_ce sha256_arm64 sha1_ce hinic sg hibmc_drm ttm drm_kms_helper drm fb_sys_fops syscopyarea sysfillrect sysimgblt hns_roce_hw_v2 hns_roce ib_core 2019-05-17T15:43:36.566357+08:00|warning|kernel[-]|[12727.392156] realtek hns3 hclge hnae3 remote_trigger(O) vhost_net(O) tun(O) vhost(O) tap ip_tables dm_mod ipmi_si ipmi_devintf ipmi_msghandler megaraid_sas hisi_sas_v3_hw hisi_sas_main br_netfilter xt_sctp 2019-05-17T15:43:36.566371+08:00|warning|kernel[-]|[12727.392178] CPU: 70 PID: 13816 Comm: vnc_worker Kdump: loaded Tainted: G O 4.19.36-1.2.142.aarch64 #1 2019-05-17T15:43:36.566383+08:00|warning|kernel[-]|[12727.392179] Hardware name: Huawei TaiShan 2280 V2/BC82AMDC, BIOS 0.12 05/14/2019 2019-05-17T15:43:36.566394+08:00|warning|kernel[-]|[12727.392181] pstate: 80400009 (Nzcv daif +PAN -UAO) 2019-05-17T15:43:36.566404+08:00|warning|kernel[-]|[12727.392182] pc : vfio_unmap_unpin+0x300/0x370 2019-05-17T15:43:36.566414+08:00|warning|kernel[-]|[12727.392183] lr : vfio_unmap_unpin+0xe4/0x370 2019-05-17T15:43:36.566425+08:00|warning|kernel[-]|[12727.392184] sp : ffff0000216eb950 2019-05-17T15:43:36.566439+08:00|warning|kernel[-]|[12727.392185] x29: ffff0000216eb950 x28: ffffa05deef8e280 2019-05-17T15:43:36.566449+08:00|warning|kernel[-]|[12727.392187] x27: ffffa05deef8fa80 x26: ffff8042055f6688 2019-05-17T15:43:36.566460+08:00|warning|kernel[-]|[12727.392189] x25: ffff0000216eb9d8 x24: 00000000008b29d8 2019-05-17T15:43:36.566470+08:00|warning|kernel[-]|[12727.392191] x23: ffff804104c5b700 x22: 00000008fb51e000 2019-05-17T15:43:36.566480+08:00|warning|kernel[-]|[12727.392193] x21: 0000000a40000000 x20: 0000000000000000 2019-05-17T15:43:36.566490+08:00|warning|kernel[-]|[12727.392195] x19: ffff8042055f6680 x18: ffff000009605d28 2019-05-17T15:43:36.566501+08:00|warning|kernel[-]|[12727.392197] x17: 0000000000000000 x16: 000000000000000c 2019-05-17T15:43:36.566511+08:00|warning|kernel[-]|[12727.392199] x15: 00000000ffffffff x14: 000000000000003f 2019-05-17T15:43:36.566523+08:00|warning|kernel[-]|[12727.392201] x13: 0000000000001000 x12: 0000000000000000 2019-05-17T15:43:36.566533+08:00|warning|kernel[-]|[12727.392203] x11: ffff805d7aa8df00 x10: 000000000000000c 2019-05-17T15:43:36.566543+08:00|warning|kernel[-]|[12727.392205] x9 : 000000000000000c x8 : 0000000000000000 2019-05-17T15:43:36.566554+08:00|warning|kernel[-]|[12727.392207] x7 : 0000000000000009 x6 : 00000000ffffffff 2019-05-17T15:43:36.566564+08:00|warning|kernel[-]|[12727.392209] x5 : 0000000000000000 x4 : 0000000000000001 2019-05-17T15:43:36.566576+08:00|warning|kernel[-]|[12727.392211] x3 : 0000000000000001 x2 : 0000000000000000 2019-05-17T15:43:36.566586+08:00|warning|kernel[-]|[12727.392213] x1 : 0000000000000000 x0 : 0000000000000000 2019-05-17T15:43:36.566597+08:00|warning|kernel[-]|[12727.392215] Call trace: 2019-05-17T15:43:36.566607+08:00|warning|kernel[-]|[12727.392217] vfio_unmap_unpin+0x300/0x370 2019-05-17T15:43:36.566618+08:00|warning|kernel[-]|[12727.392218] vfio_remove_dma+0x2c/0x80 2019-05-17T15:43:36.566628+08:00|warning|kernel[-]|[12727.392220] vfio_iommu_unmap_unpin_all+0x2c/0x48 2019-05-17T15:43:36.566638+08:00|warning|kernel[-]|[12727.392221] vfio_iommu_type1_detach_group+0x2e8/0x2f0 2019-05-17T15:43:36.566648+08:00|warning|kernel[-]|[12727.392226] __vfio_group_unset_container+0x54/0x180 2019-05-17T15:43:36.566659+08:00|warning|kernel[-]|[12727.392228] vfio_group_try_dissolve_container+0x54/0x68 2019-05-17T15:43:36.566669+08:00|warning|kernel[-]|[12727.392230] vfio_group_put_external_user+0x20/0x38 2019-05-17T15:43:36.566680+08:00|warning|kernel[-]|[12727.392235] kvm_vfio_group_put_external_user+0x38/0x50 2019-05-17T15:43:36.566690+08:00|warning|kernel[-]|[12727.392236] kvm_vfio_destroy+0x5c/0xc8 2019-05-17T15:43:36.566700+08:00|warning|kernel[-]|[12727.392237] kvm_put_kvm+0x1c8/0x2e0 2019-05-17T15:43:36.566710+08:00|warning|kernel[-]|[12727.392239] kvm_vm_release+0x2c/0x40 2019-05-17T15:43:36.566721+08:00|warning|kernel[-]|[12727.392243] __fput+0xac/0x218 2019-05-17T15:43:36.566731+08:00|warning|kernel[-]|[12727.392244] ____fput+0x20/0x30 2019-05-17T15:43:36.566741+08:00|warning|kernel[-]|[12727.392247] task_work_run+0xc0/0xf8 2019-05-17T15:43:36.566751+08:00|warning|kernel[-]|[12727.392250] do_exit+0x300/0x5b0 2019-05-17T15:43:36.566761+08:00|warning|kernel[-]|[12727.392251] do_group_exit+0x3c/0xe0 2019-05-17T15:43:36.566772+08:00|warning|kernel[-]|[12727.392254] get_signal+0x12c/0x6e0 2019-05-17T15:43:36.566783+08:00|warning|kernel[-]|[12727.392257] do_signal+0x180/0x288 2019-05-17T15:43:36.566793+08:00|warning|kernel[-]|[12727.392259] do_notify_resume+0x100/0x188 2019-05-17T15:43:36.566804+08:00|warning|kernel[-]|[12727.392261] work_pending+0x8/0x10 2019-05-17T15:43:36.566814+08:00|warning|kernel[-]|[12727.392263] ---[ end trace 12212429631eec72 ]---
